A New Jersey homeowner paying $18,000 in property taxes and $14,000 in state income taxes has been writing off barely a third of that bill on her federal return since 2018. Starting with the 2026 tax year, she can deduct every dollar of it.
The federal cap on state and local tax (SALT) deductions is jumping from $10,000 to $40,400 for single and joint filers, according to IRS inflation-adjustment guidance tied to Rev. Proc. 2025-32. Married couples filing separately get a $20,200 limit. The statutory authority is Public Law 119-21, the sprawling tax-and-spending package known as the One, Big, Beautiful Bill, which the 119th Congress enacted after years of bipartisan lobbying from lawmakers in high-tax states who called the old cap a targeted penalty on their constituents.
The math shift is dramatic. That New Jersey homeowner with $32,000 in combined state and local taxes? Under the old rules, $22,000 of it simply vanished from her return. Under the 2026 framework, the full amount qualifies for deduction, assuming her modified adjusted gross income (MAGI) stays below a phase-out threshold the IRS has yet to spell out in detail. At an illustrative 24 percent marginal federal rate, recapturing that $22,000 deduction translates to roughly $5,280 in additional tax savings on a return filed in early 2027.
Who stands to benefit the most
The original $10,000 cap arrived with the 2017 Tax Cuts and Jobs Act and landed hardest in states where property values and income tax rates run well above the national average. According to Tax Foundation research, roughly 10 to 14 million filers saw their SALT deductions curtailed each year under the cap. Many of those households stopped itemizing altogether because their largest write-off had been slashed, making the standard deduction the better deal.
The higher ceiling flips that calculation for a wide band of upper-middle-income homeowners. Families in the New York City suburbs, coastal California, and northern New Jersey, where combined property and state income taxes routinely run $25,000 to $40,000, could recapture thousands of dollars in deductions they have been forfeiting for eight years. The benefit reaches beyond the coasts, too: Illinois homeowners face some of the nation’s highest effective property tax rates, and filers in Oregon and Minnesota contend with steep state income taxes.
One wrinkle worth flagging: the 2026 standard deduction is also climbing under the same inflation adjustments. If it rises high enough, some filers who would otherwise benefit from the expanded SALT cap may still find that taking the standard deduction is simpler and worth roughly the same amount. Tax preparers will need to run both calculations for clients whose itemized totals land in the gray zone.
The MAGI phase-out: a critical detail still taking shape
The new law includes an income-based phase-out that reduces the SALT deduction as a filer’s MAGI climbs above a specified threshold. The IRS has acknowledged the phase-out’s existence in its guidance but has not yet published the exact income levels at which the reduction begins, the rate at which it proceeds, or worked examples for each filing status. (The agency’s general withholding guide, Publication 505, is expected to be updated once those details are finalized.)
That gap matters more than it might seem. A couple earning $250,000 in a high-tax suburb may capture the full $40,400 deduction, while a couple earning $500,000 in the same town could see much of the benefit clawed back. Until the IRS releases detailed rate schedules or updates its withholding estimator, taxpayers and accountants are working with an incomplete picture. Neither the Treasury Department nor the Joint Committee on Taxation has published distributional tables showing how the expanded cap shakes out by state or income bracket, so early estimates of winners and losers should be treated as preliminary rather than settled analysis.
What the IRS has locked in, and what it has not
As of June 2026, here is what rests on firm statutory and regulatory ground:
- The 2026 SALT cap is $40,400 for single and joint filers and $20,200 for married-filing-separately returns, per Rev. Proc. 2025-32.
- The cap covers the combined total of state and local income taxes (or sales taxes, if elected) and property taxes.
- A MAGI-based phase-out will reduce the deduction for higher earners, though specific thresholds and reduction rates have not been published.
- The statutory authority is Public Law 119-21, which the IRS cross-references in its inflation-adjustment announcement.
Still unconfirmed: the precise MAGI levels at which the phase-out kicks in and ends for each filing status, the number of filers expected to shift from the standard deduction back to itemizing, any state-by-state revenue projections, and whether the $40,400 figure will be indexed to inflation in future years or reset by subsequent legislation.
What about the AMT?
Taxpayers who benefit most from the expanded SALT cap tend to be the same ones who have historically triggered the alternative minimum tax (AMT), which disallows SALT deductions entirely under its parallel calculation. The One, Big, Beautiful Bill raised AMT exemption amounts alongside the SALT cap, but the interplay between the two provisions can still erode savings for filers in the upper-income tiers. Anyone projecting a large SALT benefit should have their tax professional run an AMT check before adjusting withholding.
How homeowners should prepare before year-end
Tax professionals in high-tax states are already telling clients to revisit their withholding and estimated payment schedules. If the higher SALT deduction substantially lowers a household’s projected 2026 federal liability, overpaying through payroll withholding all year means lending the government money at zero interest.
A few concrete steps worth taking now:
- Pull your 2025 return. Look at Line 5 of Schedule A (state and local taxes) and compare it to the new $40,400 ceiling. The difference is your potential additional deduction.
- Rerun the itemize-vs.-standard-deduction comparison. With the SALT cap quadrupled, filers who switched to the standard deduction after 2017 may find itemizing pays off again.
- Watch for IRS updates on the phase-out. The most reliable source is the agency’s online account portal and its updated publications. Acting on secondhand summaries risks relying on incomplete numbers.
- Coordinate with your state return. Some states decouple from federal itemization rules. Confirm that your state allows the same deductions before restructuring your entire plan.
Eight years of pent-up deductions, one big reset
For the millions of families who watched their SALT deductions get capped at $10,000 through eight filing seasons, the jump to $40,400 is the single largest expansion of this write-off in nearly a decade. The full value will hinge on income-based limits that are still being fleshed out and on each filer’s individual tax profile. But the structural change is enacted law, not a proposal, and the planning window is open now.
David M. Keller is a finance writer based in Columbus, Ohio, covering personal finance and consumer-focused economic topics. He earned his degree in journalism from Ohio University and began his career reporting on local business and economic trends for a regional media outlet. Since then, he has contributed to a variety of online publications, focusing on clear, practical coverage of topics such as cost of living, debt, and everyday financial decision-making.
